/*
 * Eugen Stoian <stoian.e@gmail.com> 2010
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <QFile>
#include <QtDebug>
#include "MathParser.h"
//#include "Math.lexer.hpp"
#include "VariableNode.h"
#include "UserFunTable.h"
extern int yylex (void);
extern void yyerror (char const *);
extern int yyparse();
extern void yyset_in(FILE*);
extern int yy_scan_string(const char*);
MathParser::MathParser()
{
}

MathParser& MathParser::instance(){
    static MathParser parser;
    return parser;
}

void MathParser::parseFile(const QString& fileName){/*
    QFile file(fileName);
    file.open(QIODevice::ReadOnly);
    FILE* f = fdopen(file.handle(),"r");
    yyset_in(f);
    yyparse();
    file.close();
    */
}

void MathParser::parse(const QString& str){
    yy_scan_string(str.toAscii().data());
    yyparse();
}

SmartPtr<ExpressionTreeNode> MathParser::getTree(const QString & str){
    int i = str.indexOf("[");
    QString name = str.mid(0,i);
    int arity = str.count(',') + 1;
    name = name + "_" + QString::number(arity);
    return UserFunTable::find(name);
}

void MathParser::removeFun(const QString & str){
    int i = str.indexOf("[");
    QString name = str.mid(0,i);
    int arity = str.count(',') + 1;
    name = name + "_" + QString::number(arity);
    UserFunTable::remove(name);
}
